Bug 81627 - Show %-targets without prerequisites in inference chain

[mohawk2]

In issue 80368 it can be seen that it can be a problem that %-targets without prerequisites are not shown in ambiguous inference chains.

With the following attached makefile try:

$ ./dmake/dmake.exe -rf makefile.mk

There will be no indication that the lev2%.txt or lev2%.html targets are used for the inference chain.

[mohawk2]

SHELL*:=/bin/sh
SHELLFLAGS*:=-ce

lev0%.html : lev1%.txt
        echo rule 2
        echo $< $@

lev0%.html : lev1%.html
        echo rule 1
        echo $< $@

lev1%.txt : lev2%.txt
        echo rule txt
        echo $< $@

lev1%.html : lev2%.html
        echo rule html
        echo $< $@

lev2%.txt :
        echo Default txt
        echo $< $@

lev2%.html :
        echo Default html
        echo $< $@

aaa : lev0blah.html
        echo aaa

[mohawk2]

https://issues.apache.org/ooo/show_bug.cgi?id=81627